Lg U450

Power on phone with an original (from the locked carrier) SIM card inserted
Type 2945#*9636#
The phone will then prompt "Unlock sim". Press "OK"
The phone will then prompt "Network Unlock". Press "OK"
Enter the 8 digit unlocking code. Press OK. If the unlocking code comes with only 7 digits, add a 0 in front of the 7 digit code. If the unlocking code comes with only 6 digits, add 00 in front of the 6 digit code.
he phone will give you message "Succeess"
Go back to the main screen and enter 2945#*88110#
The phone will then prompt "Unlock sim". Press "OK"
The phone will then prompt "Network Unlock/Lock" but if you scroll down you will see a message Enter SP Lock. Enter SP Code
Then press "OK"
Your phone is unlocked